A pulley is a simple machine essentially designed of a wheel with a grooved rim, in which a rope or chain can run to change the direction of the pull, and thereby lift the load.
Some Examples of Pulleys:
Flag poles are an example of a single fixed pulley.
That's because the rope goes through a groove in
a wheel at the top of the mast. When you pull one rope
the flag will go up. When you pull another rope the flag
will go down.
The classroom blinds is an example of a single fixed pulley
The crane is an example of a single movable pulley.
This is because the rope that runs through the wheel with a grooved rim,
and the load is attached to the hook and the effort goes up.
The school's stage curtain is an example of a single movable pulley.
Imagine life without simple machines. The single fixed and single movable pulleys give a mechanical advantage . For the single fixed pulley, there's only one rope supporting the load. Therefore, it doesn't give a mechanical advantage. The single movable pulley gives a mechanical advantage because the load divided by the number of ropes supporting the load makes it feel lighter. So, since there are two ropes supporting the load, it gives the 1/2 the effort to lift it.
Single fixed/ Single movable
A pulley is a simple machine essentially designed of a wheel with a grooved rim, in which a rope or chain can run to change the direction of the pull, and thereby lift the load.
Some Examples of Pulleys:
Flag poles are an example of a single fixed pulley.
That's because the rope goes through a groove in
a wheel at the top of the mast. When you pull one rope
the flag will go up. When you pull another rope the flag
will go down.
The classroom blinds is an example of a single fixed pulley
This is because the rope that runs through the wheel with a grooved rim,
and the load is attached to the hook and the effort goes up.
Imagine life without simple machines. The single fixed and single movable pulleys give a mechanical advantage . For the single fixed pulley, there's only one rope supporting the load. Therefore, it doesn't give a mechanical advantage. The single movable pulley gives a mechanical advantage because the load divided by the number of ropes supporting the load makes it feel lighter. So, since there are two ropes supporting the load, it gives the 1/2 the effort to lift it.